Collapsible last.



W. A. 'KRENTLHL Y coLLAPsIBLE LAST. APPLICATION FILED JUNE l2, |914.

Patented May 11, 1915.

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WAL'EnA. KRE'NTLER, oF DETROIT, lammeren, AssIGNoia To KRENTLER-AR'NOLDHINGE LAST COMPANY, OF DETROIT, MICHGAN, A CORPQRATION 0F MICHIGAN.

" ooLLAPsIBLE LAST.

Application filed June 12|, 1914. Serial No. 844,665.

To'a'ZZ whoml it may concern:

Be itknownthatl, VALTER A. KRENTLER,

a. citizen of the .United Statesfand resident of Detroit, countyl of'Vvayne, State of Michigan, have invented an Improvement in -CollapsibleLasts', 1of Which the following descriptiomin connection -with theaccompanying drawings, is a specification, like letters on thedrawings'representing like parts. l

My presentl invention-is an improved colllapsible hinged lastof the typeillustrated in the prior Pym Patent No. 673,889, showing the originalcollapsible .last construction; My present collapsible 'last is alsointended to employ the locking feature, and improved hinge construction,so 'far as' the same `is possibleof my prior patent- 1,094,153. My

saidl patentillustrates a. novel form ofI knuckle jointlast, with thelhinge members anchored at their ends most remote,fron i the pintle orhinge pivot on ivhich the parts swing-,so Athatthe solid Wood ofthe lastvrilltake' thcstrain and relieve thelnuckle portion of the wood from the1breaking strain and pressures-of lasting. machines,

leveling machines, heeling machines, and the like,"

An important featureof'inyy present collapsible last construction isthat thel hinge members'constitute interlocking` devices to aid intaking up the torsional tivist and strain brought thereon, one hinge4member beingr inthe form of a.l rounded tub'ular memher fitting;lsnugly" in a hored'recess in' one part, preferabliv the forepart of thelast, and

the ,other hingemember being a'plate' member,' fitting tightl)y in asavv kerf of a. width substantially'equal to the. width of the plate,and this plate is pivoted through the. tubular xmember, which is slottedto receive the same.

Furthermore, this plate-v is-provlded ivlth an extensionl to engage' thecollapsible instep block and depress the same, automatically, when theforepart and heel part of the last are broken or Hened' for the removalffrom or-'in'sert-ion in a shoe.: By having the plate.

member thus held b v the ivalls of the savv kerf in which it fits Aandalso fitting' in the' lslot adapted to vreceive said plate atQthepivotal portion ofy the tubular hinge. member. the tubular hin'gze isnecessarily.prevented fronrturning .or twisting' in the forepart,

:and therefore this :tubular n-ieniber-does not .depend wholly upontherlvetor pin which anchors the remote end thereof for its torsionalstrength. l

Other features of thev invention, details of construction, and novelcombinations of parts, will be hereinafter more fully point ed out andclaimed. i Referring to the drawings, illustrating a preferredembodimentof the invention, Fig-y ure l is a side vieiv of a last,with-portions broken airajiyand a part ofthe lockingr de'- vice shown incross section.;` Fig, "lis-a view of the last when lexedor collapsed,portions being broken aivav. and also parts being fshoivn in crosssection 1,' and Fig. 3is a top plan vieu' of the hinge members.

I prefer to emboliV the present invention Patented. 31113414915.'

` in the socalled knuckle `icint orA Kant- .brake type of hingedlast.'and to arrange the coilapsible instep portion on a line of cut.and spring substantially as shoivnin `Unite`d Statesy Patent No.947.972.

As illustrated in the annexed the 'forepart l of a. divided lastisprovided with its instep portion 2I separated from the for'epartl by acut vout section indicated by the curved lines of cut el', l .leavingthe \vood"of the lastof both sections l and ,2 integral at the point 5.The heel. part, 3 is divided from the forepart l by a partially curvedline of cut 6 and partially straight `out T, tov provide the .knucklejoint construction explained in said prior Pvm patent, 'the'forepartfand yheel part l. e1ng-further pro.- A

" vide'dv with secant faces' Sand 9 respectively inthe upper portion ofthe last to permit of the relative pivotal movement or liexinp,r of the'tito parts when moved Aon -the hinge members. In the forepart l I borea recess lO to receive the. tubular hinge member 1l,

which member is anchored to the wood of.v

the forepartbv a pin l2 passing 'through holes provided thereforfi'n themember-lh,

-and through thesolid ivood portions of the 5 Th e last, remote fromthe, pivot pin l-.

yforward portion of the tubular member 11` is`slottcd at 14 toreceive.the'hinge-platcto be described, secured inthe heel part. Theheel part 3 has a vertical saw kerf 13 formed vtherein ofappropriate.width to ref'clve the hing-e plate 1G. \vhicl1'plate is.anchored .to

the heel portionbfv the pivot pin 1T. passing'- throirgh a hole thereforin'the plate 1f and through the solid portions of the heel remote'fromthe pivotpin 13, which pivot pin also passes through a hole providedtherefor in the forward portion of the plate 16, as Clearly1 indicatedin the drawings. This plate 16 is adapted to fit closel)vv through theslot 14 in the tubular member 11, so that it is firmly and pivotall)Ypinned to said tubular member, as well to the ivood on either part ofthe member v11 in the projecting k-nuclrle portion of the heel part..This knuckle portion is furthermore bored 'ally as indicated on the line1S, to receive the projecting end of the tubular hinge member 11, thisboring being in elieet acounterboring partially included 'within the sawkorf 15.

In order to etlect the collapsing feature, depressing the instep block 2when the last is collapsed and forcibly expanding the same when the lastis straightened, the portion 2 is provided with a saw lie-rf 19 toreceive the projeeting portion 2O oi' the hinge plate 16, saidprojecting portion having a cam groove 21 formed therein and adapted totit about a pin' 22 passing through said cam groove and through the noodof the last on either side of the savv hert 19, The cam path 721 may endin a slightly enlarged seat 23 into which the pin Z2 will snap whenthe'last is completely flexed and the instep portion in final collapsedcondition with the faces oi the lines ot out l. *l in Contact and theopposite secant :tacos S and 9 preferably also t in contact asillustrated in Fig. 21

in automatic loclr is provided, consisting #dinger or ballvpreterabljvvv 'of hardened eel, both heing entirely concealed vvithintine tut-nier member 11. with the spring sea on the pin .an exertingexpansive tension through the ball 25 on the plate 16.

'lo operate with the ball Q5 and spring 2 V[orio the edge of the plate16, Where said plate is fitted through the slot 14 of the i 1lar hingemember 11, in the form of im to he engaged by the hall E5 v." inextended position and to th f i a locking device as may "ig initiativeflexing, 'x start theflexi t? ll an last is lien tno last pai 's line oftensio rted by the 1 A sill hold the -1 I "ved,

e a lo nig cle-rice tion, ano to in platel is oess the pin 1will inxtreme c l reces o .vhie

' the last this enel t provided snap as a' an eipansible coiled springand a` and recess 27. The recess i7 n The operation of the collapsiblehinged last vvill, it is believed, be clearly understood.

The engagement oi the Cain plate 21 and pin 22 are such as to collapseor spring the instep portion of the torepart 1 inwardly during thelit-Xing of the lorepart and heel part on the pivotal hinge 13, whilethe reverse movement to expand the last, forces the instep portionoutwardly into its norma-l or expanded position by engagement of the pin22 on the shorter :tace of the cam groove '21. IThe arrangement of thetubular member 411 and plate 1G verz-'ite to ffreatly assist the entire.last in inannaining original form and rigidity, the plate 16 in theheel part, being supported by the side walls ol. the savv hert' 15 asalready explained. Furthermore the plate 1G', having its firivardlyprojecting portion 2() lirnily supported hy the side Walls of the sawlierf 19 in the instep portion 2 of the orepart, aids greatly in holdingthe forepart, heel partand hinge member 1l all in proper alinement.

It will be appreciated that. it is of great importance to maintain theforepart, heel part and instep block in their normal relation, both4 inalineinent and contact, especially in a Collapsible last, to' preventany parts from Working loose during use. As soon as a pivot, a lasthinge, a bearing socket, or the keri's or sockets for the hinge parts,become the least Worn', or loose, thev forepart and heel part arequickly driven apart, lose their shape, style and usefulness,

and the last is necessarily discarded. By 100 my present invention,utilizing the remote anchoring pins 12 and 17, and the coperatingsupporting Walls of the kerfs 15 and 19 for the hinge plate, to hold allthe -last parts,

as Well as the hinge member 11, in alinement 105 .and torsional strain,I have proc" d a collapsible last capable of suce y withstanding thegreat strains incident to the use oit' modern lai-fili speed shoemachines, ynovv in sach al ,i prior construction of yeollapsibl lastsfailed to stand up satisfactorily to these requiremei l it :nv presentinvention has enabled le lasts to be again commercially position to re i,stribed my invention, Whatl ev.' and desireto secure by Letters lientist collapsible hinged last, having in com 120 hination, a dividedforepart -having` a bored socket and a movable instep portion having a.vertical. saw hert, a heel part having a vertical nerf in central,intersecting, lon almement with the rear'oi` said 125 M with the firstnamed saw leril, a. tuoular innere-d member. fitted in said bored theiorepar; and projecting rearvivardljf troni said i'orepart into the heelpart Where it is provided with a vertical slot 13) The the presenteXactingshoe-factory alined with said two saw nerfs, and a hingedplate-member fitted in s'aidsaw kerf in the heel part nfsupportedengagement with the walls adjacentsad* kerf,' occupying thev slot insaid' tubular hinged member, and connceted to the latter by a ypivotpn nthe heel part, passing through said Yrear outer end of, the tubularhinged member, said plate? member'having er.projectingy portion fitted-Within the sayY ker of said linstep portion nd supported by the vWallsof said last memtioned saw korf and having a cam groove and pinconnection with said instep pornon, and said tubular hinged memberbeing' ironisverscly anchored at its forward @mi within the ''orepaltbeyond its pivotal connection in the heel part, with saic plate-nn: Intestimony wher-@oil 11 i t name to this spezieftien? n iin... twolsubscribing with :it

WALTER A KRENTLER. VVnnesses:

E. O. KREN'HJER, MINNIE R. B011F91,

